View Single Post
Old 01-11-2017, 02:47 PM   #23 (permalink)
gumby79
Master EcoModder
 
gumby79's Avatar
 
Join Date: Dec 2014
Location: Butte, Montana
Posts: 420

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
Last 3: 24.65 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 24 AUTO
Pickups
Team Cummins
90 day: 22.62 mpg (US)
Thanks: 131
Thanked 198 Times in 138 Posts
Quote:
Originally Posted by Hersbird View Post
This paper shows the vortex generators hurt but they don't look the same as the littles ones I have seen.
https://www.google.com/url?sa=t&sour...Qs3Wg-JJm7lr0w
The VG on top(1"x1"x1/8"x1'-1.5'aluminum angle) have a blunt front and rear (rectangular). There orientation is in the direction of travel. Travel and air flow direction seldom match at the rear especially at corners.

The fronts should be curved from bace up and back. Parallelogram with curved leading and trailing edges. Not like the side VGs.(trapezoid)
This is a poor example with witch to condemn all VGs. Poor fit and finish .In my opinion.
__________________
1st gen cummins 91.5 dodge d250 ,16cm turbo housing ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 29.3mpg 97mi 3.311usg 7/27/16



  Reply With Quote
The Following User Says Thank You to gumby79 For This Useful Post:
craysus (01-12-2017)